/**********************************************************************
 *
 * StackWalker.cpp
 *
 *
 * History:
 *  2005-07-27   v1	- First public release on http://www.codeproject.com/
 *					   http://www.codeproject.com/threads/StackWalker.asp
 *  2005-07-28   v2	- Changed the params of the constructor and ShowCallstack
 *					   (to simplify the usage)
 *  2005-08-01   v3	- Changed to use 'CONTEXT_FULL' instead of CONTEXT_ALL
 *					   (should also be enough)
 *					 - Changed to compile correctly with the PSDK of VC7.0
 *					   (GetFileVersionInfoSizeA and GetFileVersionInfoA is wrongly defined:
 *						it uses LPSTR instead of LPCSTR as first paremeter)
 *					 - Added declarations to support VC5/6 without using 'dbghelp.h'
 *					 - Added a 'pUserData' member to the ShowCallstack function and the
 *					   PReadProcessMemoryRoutine declaration (to pass some user-defined data,
 *					   which can be used in the readMemoryFunction-callback)
 *  2005-08-02   v4	- OnSymInit now also outputs the OS-Version by default
 *					 - Added example for doing an exception-callstack-walking in main.cpp
 *					   (thanks to owillebo: http://www.codeproject.com/script/profile/whos_who.asp?id=536268)
 *  2005-08-05   v5	- Removed most Lint (http://www.gimpel.com/) errors... thanks to Okko Willeboordse!
 *
 **********************************************************************/
#define NOMINMAX

#include <windows.h>
#include <tchar.h>
#include <cstdio>
#pragma comment(lib, "version.lib")  // for "VerQueryValue"

#include "StackWalker.h"


// If VC7 and later, then use the shipped 'dbghelp.h'-file
#if _MSC_VER >= 1300
#include <dbghelp.h>
#else
// ARCEMU_INLINE the important dbghelp.h-declarations...
typedef enum
{
	SymNone = 0,
	SymCoff,
	SymCv,
	SymPdb,
	SymExport,
	SymDeferred,
	SymSym,
	SymDia,
	SymVirtual,
	NumSymTypes
} SYM_TYPE;
typedef struct _IMAGEHLP_LINE64
{
	DWORD					   SizeOfStruct;		   // set to sizeof(IMAGEHLP_LINE64)
	PVOID					   Key;					// internal
	DWORD					   LineNumber;			 // line number in file
	PCHAR					   FileName;			   // full filename
	DWORD64					 Address;				// first instruction of line
} IMAGEHLP_LINE64, *PIMAGEHLP_LINE64;
typedef struct _IMAGEHLP_MODULE64
{
	DWORD					   SizeOfStruct;		   // set to sizeof(IMAGEHLP_MODULE64)
	DWORD64					 BaseOfImage;			// base load address of module
	DWORD					   ImageSize;			  // virtual size of the loaded module
	DWORD					   TimeDateStamp;		  // date/time stamp from pe header
	DWORD					   CheckSum;			   // checksum from the pe header
	DWORD					   NumSyms;				// number of symbols in the symbol table
	SYM_TYPE					SymType;				// type of symbols loaded
	CHAR						ModuleName[32];		 // module name
	CHAR						ImageName[256];		 // image name
	CHAR						LoadedImageName[256];   // symbol file name
} IMAGEHLP_MODULE64, *PIMAGEHLP_MODULE64;
typedef struct _IMAGEHLP_SYMBOL64
{
	DWORD					   SizeOfStruct;		   // set to sizeof(IMAGEHLP_SYMBOL64)
	DWORD64					 Address;				// virtual address including dll base address
	DWORD					   Size;				   // estimated size of symbol, can be zero
	DWORD					   Flags;				  // info about the symbols, see the SYMF defines
	DWORD					   MaxNameLength;		  // maximum size of symbol name in 'Name'
	CHAR						Name[1];				// symbol name (null terminated string)
} IMAGEHLP_SYMBOL64, *PIMAGEHLP_SYMBOL64;
typedef enum
{
	AddrMode1616,
	AddrMode1632,
	AddrModeReal,
	AddrModeFlat
} ADDRESS_MODE;
typedef struct _tagADDRESS64
{
	DWORD64	   Offset;
	WORD		  Segment;
	ADDRESS_MODE  Mode;
} ADDRESS64, *LPADDRESS64;
typedef struct _KDHELP64
{
	DWORD64   Thread;
	DWORD   ThCallbackStack;
	DWORD   ThCallbackBStore;
	DWORD   NextCallback;
	DWORD   FramePointer;
	DWORD64   KiCallUserMode;
	DWORD64   KeUserCallbackDispatcher;
	DWORD64   SystemRangeStart;
	DWORD64  Reserved[8];
} KDHELP64, *PKDHELP64;
typedef struct _tagSTACKFRAME64
{
	ADDRESS64   AddrPC;			   // program counter
	ADDRESS64   AddrReturn;		   // return address
	ADDRESS64   AddrFrame;			// frame pointer
	ADDRESS64   AddrStack;			// stack pointer
	ADDRESS64   AddrBStore;		   // backing store pointer
	PVOID	   FuncTableEntry;	   // pointer to pdata/fpo or NULL
	DWORD64	 Params[4];			// possible arguments to the function
	BOOL		Far;				  // WOW far call
	BOOL		Virtual;			  // is this a virtual frame?
	DWORD64	 Reserved[3];
	KDHELP64	KdHelp;
} STACKFRAME64, *LPSTACKFRAME64;
typedef
BOOL
(__stdcall* PREAD_PROCESS_MEMORY_ROUTINE64)(
    HANDLE	  hProcess,
    DWORD64	 qwBaseAddress,
    PVOID	   lpBuffer,
    DWORD	   nSize,
    LPDWORD	 lpNumberOfBytesRead
);
typedef
PVOID
(__stdcall* PFUNCTION_TABLE_ACCESS_ROUTINE64)(
    HANDLE  hProcess,
    DWORD64 AddrBase
);
typedef
DWORD64
(__stdcall* PGET_MODULE_BASE_ROUTINE64)(
    HANDLE  hProcess,
    DWORD64 Address
);
typedef
DWORD64
(__stdcall* PTRANSLATE_ADDRESS_ROUTINE64)(
    HANDLE	hProcess,
    HANDLE	hThread,
    LPADDRESS64 lpaddr
);
#define SYMOPT_CASE_INSENSITIVE		 0x00000001
#define SYMOPT_UNDNAME				  0x00000002
#define SYMOPT_DEFERRED_LOADS		   0x00000004
#define SYMOPT_NO_CPP				   0x00000008
#define SYMOPT_LOAD_LINES			   0x00000010
#define SYMOPT_OMAP_FIND_NEAREST		0x00000020
#define SYMOPT_LOAD_ANYTHING			0x00000040
#define SYMOPT_IGNORE_CVREC			 0x00000080
#define SYMOPT_NO_UNQUALIFIED_LOADS	 0x00000100
#define SYMOPT_FAIL_CRITICAL_ERRORS	 0x00000200
#define SYMOPT_EXACT_SYMBOLS			0x00000400
#define SYMOPT_ALLOW_ABSOLUTE_SYMBOLS   0x00000800
#define SYMOPT_IGNORE_NT_SYMPATH		0x00001000
#define SYMOPT_INCLUDE_32BIT_MODULES	0x00002000
#define SYMOPT_PUBLICS_ONLY			 0x00004000
#define SYMOPT_NO_PUBLICS			   0x00008000
#define SYMOPT_AUTO_PUBLICS			 0x00010000
#define SYMOPT_NO_IMAGE_SEARCH		  0x00020000
#define SYMOPT_SECURE				   0x00040000
#define SYMOPT_DEBUG					0x80000000
#define UNDNAME_COMPLETE				 (0x0000)  // Enable full undecoration
#define UNDNAME_NAME_ONLY				(0x1000)  // Crack only the name for primary declaration;
#endif  // _MSC_VER < 1300

// Some missing defines (for VC5/6):
#ifndef INVALID_FILE_ATTRIBUTES
#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
#endif


// secure-CRT_functions are only available starting with VC8
#if _MSC_VER < 1400
#define strcpy_s strcpy
#define strcat_s(dst, len, src) strcat(dst, src)
#define _snprintf_s _snprintf
#define _tcscat_s _tcscat
#endif

// Normally it should be enough to use 'CONTEXT_FULL' (better would be 'CONTEXT_ALL')
#define USED_CONTEXT_FLAGS CONTEXT_FULL


class __declspec(dllexport) StackWalkerInternal
{
	public:
		StackWalkerInternal(StackWalker* parent, HANDLE hProcess)
		{
			m_parent = parent;
			m_hDbhHelp = NULL;
			pSC = NULL;
			m_hProcess = hProcess;
			m_szSymPath = NULL;
			pSFTA = NULL;
			pSGLFA = NULL;
			pSGMB = NULL;
			pSGMI = NULL;
			pSGO = NULL;
			pSGSFA = NULL;
			pSI = NULL;
			pSLM = NULL;
			pSSO = NULL;
			pSW = NULL;
			pUDSN = NULL;
			pSGSP = NULL;
		}
		~StackWalkerInternal()
		{
			if(pSC != NULL)
				pSC(m_hProcess);  // SymCleanup
			if(m_hDbhHelp != NULL)
				FreeLibrary(m_hDbhHelp);
			m_hDbhHelp = NULL;
			m_parent = NULL;
			if(m_szSymPath != NULL)
				free(m_szSymPath);
			m_szSymPath = NULL;
		}
		BOOL Init(LPCSTR szSymPath)
		{
			if(m_parent == NULL)
				return FALSE;
			// Dynamically load the Entry-Points for dbghelp.dll:
			// First try to load the newsest one from
			TCHAR szTemp[4096];
			// But before wqe do this, we first check if the ".local" file exists
			if(GetModuleFileName(NULL, szTemp, 4096) > 0)
			{
				_tcscat_s(szTemp, _T(".local"));
				if(GetFileAttributes(szTemp) == INVALID_FILE_ATTRIBUTES)
				{
					// ".local" file does not exist, so we can try to load the dbghelp.dll from the "Debugging Tools for Windows"
					if(GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0)
					{
						_tcscat_s(szTemp, _T("\\Debugging Tools for Windows\\dbghelp.dll"));
						// now check if the file exists:
						if(GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
						{
							m_hDbhHelp = LoadLibrary(szTemp);
						}
					}
					// Still not found? Then try to load the 64-Bit version:
					if((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
					{
						_tcscat_s(szTemp, _T("\\Debugging Tools for Windows 64-Bit\\dbghelp.dll"));
						if(GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
						{
							m_hDbhHelp = LoadLibrary(szTemp);
						}
					}
				}
			}
			if(m_hDbhHelp == NULL)   // if not already loaded, try to load a default-one
				m_hDbhHelp = LoadLibrary(_T("dbghelp.dll"));
			if(m_hDbhHelp == NULL)
				return FALSE;
			pSI = (tSI) GetProcAddress(m_hDbhHelp, "SymInitialize");
			pSC = (tSC) GetProcAddress(m_hDbhHelp, "SymCleanup");

			pSW = (tSW) GetProcAddress(m_hDbhHelp, "StackWalk64");
			pSGO = (tSGO) GetProcAddress(m_hDbhHelp, "SymGetOptions");
			pSSO = (tSSO) GetProcAddress(m_hDbhHelp, "SymSetOptions");

			pSFTA = (tSFTA) GetProcAddress(m_hDbhHelp, "SymFunctionTableAccess64");
			pSGLFA = (tSGLFA) GetProcAddress(m_hDbhHelp, "SymGetLineFromAddr64");
			pSGMB = (tSGMB) GetProcAddress(m_hDbhHelp, "SymGetModuleBase64");
			pSGMI = (tSGMI) GetProcAddress(m_hDbhHelp, "SymGetModuleInfo64");
			//pSGMI_V3 = (tSGMI_V3) GetProcAddress(m_hDbhHelp, "SymGetModuleInfo64" );
			pSGSFA = (tSGSFA) GetProcAddress(m_hDbhHelp, "SymGetSymFromAddr64");
			pUDSN = (tUDSN) GetProcAddress(m_hDbhHelp, "UnDecorateSymbolName");
			pSLM = (tSLM) GetProcAddress(m_hDbhHelp, "SymLoadModule64");
			pSGSP = (tSGSP) GetProcAddress(m_hDbhHelp, "SymGetSearchPath");

			if(pSC == NULL || pSFTA == NULL || pSGMB == NULL || pSGMI == NULL ||
			        pSGO == NULL || pSGSFA == NULL || pSI == NULL || pSSO == NULL ||
			        pSW == NULL || pUDSN == NULL || pSLM == NULL)
			{
				FreeLibrary(m_hDbhHelp);
				m_hDbhHelp = NULL;
				pSC = NULL;
				return FALSE;
			}

			// SymInitialize
			if(szSymPath != NULL)
				m_szSymPath = _strdup(szSymPath);
			if(this->pSI(m_hProcess, m_szSymPath, FALSE) == FALSE)
				this->m_parent->OnDbgHelpErr("SymInitialize", GetLastError(), 0);

			DWORD symOptions = this->pSGO();  // SymGetOptions
			symOptions |= SYMOPT_LOAD_LINES;
			symOptions |= SYMOPT_FAIL_CRITICAL_ERRORS;
			//symOptions |= SYMOPT_NO_PROMPTS;
			// SymSetOptions
			symOptions = this->pSSO(symOptions);

			char buf[StackWalker::STACKWALK_MAX_NAMELEN] = {0};
			if(this->pSGSP != NULL)
			{
				if(this->pSGSP(m_hProcess, buf, StackWalker::STACKWALK_MAX_NAMELEN) == FALSE)
					this->m_parent->OnDbgHelpErr("SymGetSearchPath", GetLastError(), 0);
			}
			char szUserName[1024] = {0};
			DWORD dwSize = 1024;
			GetUserNameA(szUserName, &dwSize);
			this->m_parent->OnSymInit(buf, symOptions, szUserName);

			return TRUE;
		}

		StackWalker* m_parent;

		HMODULE m_hDbhHelp;
		HANDLE m_hProcess;
		LPSTR m_szSymPath;

		/*typedef struct IMAGEHLP_MODULE64_V3 {
			DWORD	SizeOfStruct;		   // set to sizeof(IMAGEHLP_MODULE64)
			DWORD64  BaseOfImage;			// base load address of module
			DWORD	ImageSize;			  // virtual size of the loaded module
			DWORD	TimeDateStamp;		  // date/time stamp from pe header
			DWORD	CheckSum;			   // checksum from the pe header
			DWORD	NumSyms;				// number of symbols in the symbol table
			SYM_TYPE SymType;				// type of symbols loaded
			CHAR	 ModuleName[32];		 // module name
			CHAR	 ImageName[256];		 // image name
			// new elements: 07-Jun-2002
			CHAR	 LoadedImageName[256];   // symbol file name
			CHAR	 LoadedPdbName[256];	 // pdb file name
			DWORD	CVSig;				  // Signature of the CV record in the debug directories
			CHAR		 CVData[MAX_PATH * 3];   // Contents of the CV record
			DWORD	PdbSig;				 // Signature of PDB
			GUID	 PdbSig70;			   // Signature of PDB (VC 7 and up)
			DWORD	PdbAge;				 // DBI age of pdb
			BOOL	 PdbUnmatched;		   // loaded an unmatched pdb
			BOOL	 DbgUnmatched;		   // loaded an unmatched dbg
			BOOL	 LineNumbers;			// we have line number information
			BOOL	 GlobalSymbols;		  // we have internal symbol information
			BOOL	 TypeInfo;			   // we have type information
			// new elements: 17-Dec-2003
			BOOL	 SourceIndexed;		  // pdb supports source server
			BOOL	 Publics;				// contains public symbols
		};
		*/
		typedef struct IMAGEHLP_MODULE64_V2
		{
			DWORD	SizeOfStruct;		   // set to sizeof(IMAGEHLP_MODULE64)
			DWORD64  BaseOfImage;			// base load address of module
			DWORD	ImageSize;			  // virtual size of the loaded module
			DWORD	TimeDateStamp;		  // date/time stamp from pe header
			DWORD	CheckSum;			   // checksum from the pe header
			DWORD	NumSyms;				// number of symbols in the symbol table
			SYM_TYPE SymType;				// type of symbols loaded
			CHAR	 ModuleName[32];		 // module name
			CHAR	 ImageName[256];		 // image name
			CHAR	 LoadedImageName[256];   // symbol file name
		};


		// SymCleanup()
		typedef BOOL (__stdcall* tSC)(IN HANDLE hProcess);
		tSC pSC;

		// SymFunctionTableAccess64()
		typedef PVOID(__stdcall* tSFTA)(HANDLE hProcess, DWORD64 AddrBase);
		tSFTA pSFTA;

		// SymGetLineFromAddr64()
		typedef BOOL (__stdcall* tSGLFA)(IN HANDLE hProcess, IN DWORD64 dwAddr,
		                                 OUT PDWORD pdwDisplacement, OUT PIMAGEHLP_LINE64 Line);
		tSGLFA pSGLFA;

		// SymGetModuleBase64()
		typedef DWORD64(__stdcall* tSGMB)(IN HANDLE hProcess, IN DWORD64 dwAddr);
		tSGMB pSGMB;

		// SymGetModuleInfo64()
		typedef BOOL (__stdcall* tSGMI)(IN HANDLE hProcess, IN DWORD64 dwAddr, OUT IMAGEHLP_MODULE64_V2* ModuleInfo);
		tSGMI pSGMI;

//  // SymGetModuleInfo64()
//  typedef BOOL (__stdcall *tSGMI_V3)( IN HANDLE hProcess, IN DWORD64 dwAddr, OUT IMAGEHLP_MODULE64_V3 *ModuleInfo );
//  tSGMI_V3 pSGMI_V3;

		// SymGetOptions()
		typedef DWORD (__stdcall* tSGO)(VOID);
		tSGO pSGO;

		// SymGetSymFromAddr64()
		typedef BOOL (__stdcall* tSGSFA)(IN HANDLE hProcess, IN DWORD64 dwAddr,
		                                 OUT PDWORD64 pdwDisplacement, OUT PIMAGEHLP_SYMBOL64 Symbol);
		tSGSFA pSGSFA;

		// SymInitialize()
		typedef BOOL (__stdcall* tSI)(IN HANDLE hProcess, IN PSTR UserSearchPath, IN BOOL fInvadeProcess);
		tSI pSI;

		// SymLoadModule64()
		typedef DWORD64(__stdcall* tSLM)(IN HANDLE hProcess, IN HANDLE hFile,
		                                 IN PSTR ImageName, IN PSTR ModuleName, IN DWORD64 BaseOfDll, IN DWORD SizeOfDll);
		tSLM pSLM;

		// SymSetOptions()
		typedef DWORD (__stdcall* tSSO)(IN DWORD SymOptions);
		tSSO pSSO;

		// StackWalk64()
		typedef BOOL (__stdcall* tSW)(
		    DWORD MachineType,
		    HANDLE hProcess,
		    HANDLE hThread,
		    LPSTACKFRAME64 StackFrame,
		    PVOID ContextRecord,
		    PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
		    PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
		    PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
		    PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress);
		tSW pSW;

		// UnDecorateSymbolName()
		typedef DWORD (__stdcall WINAPI* tUDSN)(PCSTR DecoratedName, PSTR UnDecoratedName,
		                                        DWORD UndecoratedLength, DWORD Flags);
		tUDSN pUDSN;

		typedef BOOL (__stdcall WINAPI* tSGSP)(HANDLE hProcess, PSTR SearchPath, DWORD SearchPathLength);
		tSGSP pSGSP;


	private:
		// **************************************** ToolHelp32 ************************
#define MAX_MODULE_NAME32 255
#define TH32CS_SNAPMODULE   0x00000008
#pragma pack( push, 8 )
		typedef struct tagMODULEENTRY32
		{
			DWORD   dwSize;
			DWORD   th32ModuleID;	   // This module
			DWORD   th32ProcessID;	  // owning process
			DWORD   GlblcntUsage;	   // Global usage count on the module
			DWORD   ProccntUsage;	   // Module usage count in th32ProcessID's context
			BYTE*   modBaseAddr;		// Base address of module in th32ProcessID's context
			DWORD   modBaseSize;		// Size in bytes of module starting at modBaseAddr
			HMODULE hModule;			// The hModule of this module in th32ProcessID's context
			char	szModule[MAX_MODULE_NAME32 + 1];
			char	szExePath[MAX_PATH];
		} MODULEENTRY32;
		typedef MODULEENTRY32*   PMODULEENTRY32;
		typedef MODULEENTRY32*   LPMODULEENTRY32;
#pragma pack( pop )

		BOOL GetModuleListTH32(HANDLE hProcess, DWORD pid)
		{
			// CreateToolhelp32Snapshot()
			typedef HANDLE(__stdcall * tCT32S)(DWORD dwFlags, DWORD th32ProcessID);
			// Module32First()
			typedef BOOL (__stdcall * tM32F)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);
			// Module32Next()
			typedef BOOL (__stdcall * tM32N)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);

			// try both dlls...
			const TCHAR* dllname[] = { _T("kernel32.dll"), _T("tlhelp32.dll") };
			HINSTANCE hToolhelp = NULL;
			tCT32S pCT32S = NULL;
			tM32F pM32F = NULL;
			tM32N pM32N = NULL;

			HANDLE hSnap;
			MODULEENTRY32 me;
			me.dwSize = sizeof(me);
			BOOL keepGoing;
			size_t i;

			for(i = 0; i < (sizeof(dllname) / sizeof(dllname[0])); i++)
			{
				hToolhelp = LoadLibrary(dllname[i]);
				if(hToolhelp == NULL)
					continue;
				pCT32S = (tCT32S) GetProcAddress(hToolhelp, "CreateToolhelp32Snapshot");
				pM32F = (tM32F) GetProcAddress(hToolhelp, "Module32First");
				pM32N = (tM32N) GetProcAddress(hToolhelp, "Module32Next");
				if((pCT32S != NULL) && (pM32F != NULL) && (pM32N != NULL))
					break; // found the functions!
				FreeLibrary(hToolhelp);
				hToolhelp = NULL;
			}

			if(hToolhelp == NULL)
				return FALSE;

			hSnap = pCT32S(TH32CS_SNAPMODULE, pid);
			if(hSnap == (HANDLE) - 1)
				return FALSE;

			keepGoing = !!pM32F(hSnap, &me);
			int cnt = 0;
			while(keepGoing)
			{
				this->LoadModule(hProcess, me.szExePath, me.szModule, (DWORD64) me.modBaseAddr, me.modBaseSize);
				cnt++;
				keepGoing = !!pM32N(hSnap, &me);
			}
			CloseHandle(hSnap);
			FreeLibrary(hToolhelp);
			if(cnt <= 0)
				return FALSE;
			return TRUE;
		}  // GetModuleListTH32

		// **************************************** PSAPI ************************
		typedef struct _MODULEINFO
		{
			LPVOID lpBaseOfDll;
			DWORD SizeOfImage;
			LPVOID EntryPoint;
		} MODULEINFO, *LPMODULEINFO;

		BOOL GetModuleListPSAPI(HANDLE hProcess)
		{
			// EnumProcessModules()
			typedef BOOL (__stdcall * tEPM)(HANDLE hProcess, HMODULE * lphModule, DWORD cb, LPDWORD lpcbNeeded);
			// GetModuleFileNameEx()
			typedef DWORD (__stdcall * tGMFNE)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename, DWORD nSize);
			// GetModuleBaseName()
			typedef DWORD (__stdcall * tGMBN)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename, DWORD nSize);
			// GetModuleInformation()
			typedef BOOL (__stdcall * tGMI)(HANDLE hProcess, HMODULE hModule, LPMODULEINFO pmi, DWORD nSize);

			HINSTANCE hPsapi;
			tEPM pEPM;
			tGMFNE pGMFNE;
			tGMBN pGMBN;
			tGMI pGMI;

			DWORD i;
			//ModuleEntry e;
			DWORD cbNeeded;
			MODULEINFO mi;
			HMODULE* hMods = NULL;
			char* tt = NULL;
			char* tt2 = NULL;
			const SIZE_T TTBUFLEN = 8096;
			int cnt = 0;

			hPsapi = LoadLibrary(_T("psapi.dll"));
			if(hPsapi == NULL)
				return FALSE;

			pEPM = (tEPM) GetProcAddress(hPsapi, "EnumProcessModules");
			pGMFNE = (tGMFNE) GetProcAddress(hPsapi, "GetModuleFileNameExA");
			pGMBN = (tGMFNE) GetProcAddress(hPsapi, "GetModuleBaseNameA");
			pGMI = (tGMI) GetProcAddress(hPsapi, "GetModuleInformation");
			if((pEPM == NULL) || (pGMFNE == NULL) || (pGMBN == NULL) || (pGMI == NULL))
			{
				// we couldn�t find all functions
				FreeLibrary(hPsapi);
				return FALSE;
			}

			hMods = (HMODULE*) malloc(sizeof(HMODULE) * (TTBUFLEN / sizeof HMODULE));
			tt = (char*) malloc(sizeof(char) * TTBUFLEN);
			tt2 = (char*) malloc(sizeof(char) * TTBUFLEN);
			if((hMods == NULL) || (tt == NULL) || (tt2 == NULL))
				goto cleanup;

			if(! pEPM(hProcess, hMods, TTBUFLEN, &cbNeeded))
			{
				//_ftprintf(fLogFile, _T("%lu: EPM failed, GetLastError = %lu\n"), g_dwShowCount, gle );
				goto cleanup;
			}

			if(cbNeeded > TTBUFLEN)
			{
				//_ftprintf(fLogFile, _T("%lu: More than %lu module handles. Huh?\n"), g_dwShowCount, lenof( hMods ) );
				goto cleanup;
			}

			for(i = 0; i < cbNeeded / sizeof hMods[0]; i++)
			{
				// base address, size
				pGMI(hProcess, hMods[i], &mi, sizeof mi);
				// image file name
				tt[0] = 0;
				pGMFNE(hProcess, hMods[i], tt, TTBUFLEN);
				// module name
				tt2[0] = 0;
				pGMBN(hProcess, hMods[i], tt2, TTBUFLEN);

				DWORD dwRes = this->LoadModule(hProcess, tt, tt2, (DWORD64) mi.lpBaseOfDll, mi.SizeOfImage);
				if(dwRes != ERROR_SUCCESS)
					this->m_parent->OnDbgHelpErr("LoadModule", dwRes, 0);
				cnt++;
			}

		cleanup:
			if(hPsapi != NULL) FreeLibrary(hPsapi);
			if(tt2 != NULL) free(tt2);
			if(tt != NULL) free(tt);
			if(hMods != NULL) free(hMods);

			return cnt != 0;
		}  // GetModuleListPSAPI

		DWORD LoadModule(HANDLE hProcess, LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size)
		{
			CHAR* szImg = _strdup(img);
			CHAR* szMod = _strdup(mod);
			DWORD result = ERROR_SUCCESS;
			if((szImg == NULL) || (szMod == NULL))
				result = ERROR_NOT_ENOUGH_MEMORY;
			else
			{
				if(pSLM(hProcess, 0, szImg, szMod, baseAddr, size) == 0)
					result = GetLastError();
			}
			ULONGLONG fileVersion = 0;
			if((m_parent != NULL) && (szImg != NULL))
			{
				// try to retrive the file-version:
				if((this->m_parent->m_options & StackWalker::RetrieveFileVersion) != 0)
				{
					VS_FIXEDFILEINFO* fInfo = NULL;
					DWORD dwHandle;
					DWORD dwSize = GetFileVersionInfoSizeA(szImg, &dwHandle);
					if(dwSize > 0)
					{
						LPVOID vData = malloc(dwSize);
						if(vData != NULL)
						{
							if(GetFileVersionInfoA(szImg, dwHandle, dwSize, vData) != 0)
							{
								UINT len;
								TCHAR szSubBlock[] = _T("\\");
								if(VerQueryValue(vData, szSubBlock, (LPVOID*) &fInfo, &len) == 0)
									fInfo = NULL;
								else
								{
									fileVersion = ((ULONGLONG)fInfo->dwFileVersionLS) + ((ULONGLONG)fInfo->dwFileVersionMS << 32);
								}
							}
							free(vData);
						}
					}
				}

				// Retrive some additional-infos about the module
				IMAGEHLP_MODULE64_V2 Module;
				const char* szSymType = "-unknown-";
				if(this->GetModuleInfo(hProcess, baseAddr, &Module) != FALSE)
				{
					switch(Module.SymType)
					{
						case SymNone:
							szSymType = "-nosymbols-";
							break;
						case SymCoff:
							szSymType = "COFF";
							break;
						case SymCv:
							szSymType = "CV";
							break;
						case SymPdb:
							szSymType = "PDB";
							break;
						case SymExport:
							szSymType = "-exported-";
							break;
						case SymDeferred:
							szSymType = "-deferred-";
							break;
						case SymSym:
							szSymType = "SYM";
							break;
						case 8: //SymVirtual:
							szSymType = "Virtual";
							break;
						case 9: // SymDia:
							szSymType = "DIA";
							break;
					}
				}
				this->m_parent->OnLoadModule(img, mod, baseAddr, size, result, szSymType, Module.LoadedImageName, fileVersion);
			}
			if(szImg != NULL) free(szImg);
			if(szMod != NULL) free(szMod);
			return result;
		}
	public:
		BOOL LoadModules(HANDLE hProcess, DWORD dwProcessId)
		{
			// first try toolhelp32
			if(GetModuleListTH32(hProcess, dwProcessId))
				return true;
			// then try psapi
			return GetModuleListPSAPI(hProcess);
		}


		BOOL GetModuleInfo(HANDLE hProcess, DWORD64 baseAddr, IMAGEHLP_MODULE64_V2* pModuleInfo)
		{
			if(this->pSGMI == NULL)
			{
				SetLastError(ERROR_DLL_INIT_FAILED);
				return FALSE;
			}
			// First try to use the larger ModuleInfo-Structure
//	memset(pModuleInfo, 0, sizeof(IMAGEHLP_MODULE64_V3));
//	pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V3);
//	if (this->pSGMI_V3 != NULL)
//	{
//	  if (this->pSGMI_V3(hProcess, baseAddr, pModuleInfo) != FALSE)
//		return TRUE;
//	  // check if the parameter was wrong (size is bad...)
//	  if (GetLastError() != ERROR_INVALID_PARAMETER)
//		return FALSE;
//	}
			// could not retrive the bigger structure, try with the smaller one (as defined in VC7.1)...
			pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
			void* pData = malloc(4096); // reserve enough memory, so the bug in v6.3.5.1 does not lead to memory-overwrites...
			if(pData == NULL)
			{
				SetLastError(ERROR_NOT_ENOUGH_MEMORY);
				return FALSE;
			}
			memcpy(pData, pModuleInfo, sizeof(IMAGEHLP_MODULE64_V2));
			if(this->pSGMI(hProcess, baseAddr, (IMAGEHLP_MODULE64_V2*) pData) != FALSE)
			{
				// only copy as much memory as is reserved...
				memcpy(pModuleInfo, pData, sizeof(IMAGEHLP_MODULE64_V2));
				pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
				free(pData);
				return TRUE;
			}
			free(pData);
			SetLastError(ERROR_DLL_INIT_FAILED);
			return FALSE;
		}
};

// #############################################################
StackWalker::StackWalker(DWORD dwProcessId, HANDLE hProcess)
{
	this->m_options = OptionsAll;
	this->m_modulesLoaded = FALSE;
	this->m_hProcess = hProcess;
	this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
	this->m_dwProcessId = dwProcessId;
	this->m_szSymPath = NULL;
}
StackWalker::StackWalker(int options, LPCSTR szSymPath, DWORD dwProcessId, HANDLE hProcess)
{
	this->m_options = options;
	this->m_modulesLoaded = FALSE;
	this->m_hProcess = hProcess;
	this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
	this->m_dwProcessId = dwProcessId;
	if(szSymPath != NULL)
	{
		this->m_szSymPath = _strdup(szSymPath);
		this->m_options |= SymBuildPath;
	}
	else
		this->m_szSymPath = NULL;
}

StackWalker::~StackWalker()
{
	if(m_szSymPath != NULL)
		free(m_szSymPath);
	m_szSymPath = NULL;
	if(this->m_sw != NULL)
		delete this->m_sw;
	this->m_sw = NULL;
}

BOOL StackWalker::LoadModules()
{
	if(this->m_sw == NULL)
	{
		SetLastError(ERROR_DLL_INIT_FAILED);
		return FALSE;
	}
	if(m_modulesLoaded != FALSE)
		return TRUE;

	// Build the sym-path:
	char* szSymPath = NULL;
	if((this->m_options & SymBuildPath) != 0)
	{
		const size_t nSymPathLen = 4096;
		szSymPath = (char*) malloc(nSymPathLen);
		if(szSymPath == NULL)
		{
			SetLastError(ERROR_NOT_ENOUGH_MEMORY);
			return FALSE;
		}
		szSymPath[0] = 0;
		// Now first add the (optional) provided sympath:
		if(this->m_szSymPath != NULL)
		{
			strcat_s(szSymPath, nSymPathLen, this->m_szSymPath);
			strcat_s(szSymPath, nSymPathLen, ";");
		}

		strcat_s(szSymPath, nSymPathLen, ".;");

		const size_t nTempLen = 1024;
		char szTemp[nTempLen];
		// Now add the current directory:
		if(GetCurrentDirectoryA(nTempLen, szTemp) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
		}

		// Now add the path for the main-module:
		if(GetModuleFileNameA(NULL, szTemp, nTempLen) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			for(char* p = (szTemp + strlen(szTemp) - 1); p >= szTemp; --p)
			{
				// locate the rightmost path separator
				if((*p == '\\') || (*p == '/') || (*p == ':'))
				{
					*p = 0;
					break;
				}
			}  // for (search for path separator...)
			if(szTemp[0] != '\0')
			{
				strcat_s(szSymPath, nSymPathLen, szTemp);
				strcat_s(szSymPath, nSymPathLen, ";");
			}
		}
		if(GetEnvironmentVariableA("_NT_SYMBOL_PATH", szTemp, nTempLen) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
		}
		if(GetEnvironmentVariableA("_NT_ALTERNATE_SYMBOL_PATH", szTemp, nTempLen) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
		}
		if(GetEnvironmentVariableA("SYSTEMROOT", szTemp, nTempLen) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
			// also add the "system32"-directory:
			strcat_s(szTemp, nTempLen, "\\system32");
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
		}

		if((this->m_options & SymBuildPath) != 0)
		{
			if(GetEnvironmentVariableA("SYSTEMDRIVE", szTemp, nTempLen) > 0)
			{
				szTemp[nTempLen - 1] = 0;
				strcat_s(szSymPath, nSymPathLen, "SRV*");
				strcat_s(szSymPath, nSymPathLen, szTemp);
				strcat_s(szSymPath, nSymPathLen, "\\websymbols");
				strcat_s(szSymPath, nSymPathLen, "*http://msdl.microsoft.com/download/symbols;");
			}
			else
				strcat_s(szSymPath, nSymPathLen, "SRV*c:\\websymbols*http://msdl.microsoft.com/download/symbols;");
		}
	}

	// First Init the whole stuff...
	BOOL bRet = this->m_sw->Init(szSymPath);
	if(szSymPath != NULL) free(szSymPath);
	szSymPath = NULL;
	if(bRet == FALSE)
	{
		this->OnDbgHelpErr("Error while initializing dbghelp.dll", 0, 0);
		SetLastError(ERROR_DLL_INIT_FAILED);
		return FALSE;
	}

	bRet = this->m_sw->LoadModules(this->m_hProcess, this->m_dwProcessId);
	if(bRet != FALSE)
		m_modulesLoaded = TRUE;
	return bRet;
}


// The following is used to pass the "userData"-Pointer to the user-provided readMemoryFunction
// This has to be done due to a problem with the "hProcess"-parameter in x64...
// Because this class is in no case multi-threading-enabled (because of the limitations
// of dbghelp.dll) it is "safe" to use a static-variable
static StackWalker::PReadProcessMemoryRoutine s_readMemoryFunction = NULL;
static LPVOID s_readMemoryFunction_UserData = NULL;

BOOL StackWalker::ShowCallstack(HANDLE hThread, const CONTEXT* context, PReadProcessMemoryRoutine readMemoryFunction, LPVOID pUserData)
{
	CONTEXT c;;
	CallstackEntry csEntry;
	IMAGEHLP_SYMBOL64* pSym = NULL;
	StackWalkerInternal::IMAGEHLP_MODULE64_V2 Module;
	IMAGEHLP_LINE64 Line;
	int frameNum;

	if(m_modulesLoaded == FALSE)
		this->LoadModules();  // ignore the result...

	if(this->m_sw->m_hDbhHelp == NULL)
	{
		SetLastError(ERROR_DLL_INIT_FAILED);
		return FALSE;
	}

	s_readMemoryFunction = readMemoryFunction;
	s_readMemoryFunction_UserData = pUserData;

	if(context == NULL)
	{
		// If no context is provided, capture the context
		if(hThread == GetCurrentThread())
		{
			GET_CURRENT_CONTEXT(c, USED_CONTEXT_FLAGS);
		}
		else
		{
			SuspendThread(hThread);
			memset(&c, 0, sizeof(CONTEXT));
			c.ContextFlags = USED_CONTEXT_FLAGS;
			if(GetThreadContext(hThread, &c) == FALSE)
			{
				ResumeThread(hThread);
				return FALSE;
			}
		}
	}
	else
		c = *context;

	// init STACKFRAME for first call
	STACKFRAME64 s; // in/out stackframe
	memset(&s, 0, sizeof(s));
	DWORD imageType;
#ifdef _M_IX86
	// normally, call ImageNtHeader() and use machine info from PE header
	imageType = IMAGE_FILE_MACHINE_I386;
	s.AddrPC.Offset = c.Eip;
	s.AddrPC.Mode = AddrModeFlat;
	s.AddrFrame.Offset = c.Ebp;
	s.AddrFrame.Mode = AddrModeFlat;
	s.AddrStack.Offset = c.Esp;
	s.AddrStack.Mode = AddrModeFlat;
#elif _M_X64
	imageType = IMAGE_FILE_MACHINE_AMD64;
	s.AddrPC.Offset = c.Rip;
	s.AddrPC.Mode = AddrModeFlat;
	s.AddrFrame.Offset = c.Rsp;
	s.AddrFrame.Mode = AddrModeFlat;
	s.AddrStack.Offset = c.Rsp;
	s.AddrStack.Mode = AddrModeFlat;
#elif _M_IA64
	imageType = IMAGE_FILE_MACHINE_IA64;
	s.AddrPC.Offset = c.StIIP;
	s.AddrPC.Mode = AddrModeFlat;
	s.AddrFrame.Offset = c.IntSp;
	s.AddrFrame.Mode = AddrModeFlat;
	s.AddrBStore.Offset = c.RsBSP;
	s.AddrBStore.Mode = AddrModeFlat;
	s.AddrStack.Offset = c.IntSp;
	s.AddrStack.Mode = AddrModeFlat;
#else
#error "Platform not supported!"
#endif

	pSym = (IMAGEHLP_SYMBOL64*) malloc(sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
	if(!pSym) goto cleanup;   // not enough memory...
	memset(pSym, 0, sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
	pSym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
	pSym->MaxNameLength = STACKWALK_MAX_NAMELEN;

	memset(&Line, 0, sizeof(Line));
	Line.SizeOfStruct = sizeof(Line);

	memset(&Module, 0, sizeof(Module));
	Module.SizeOfStruct = sizeof(Module);

	for(frameNum = 0; ; ++frameNum)
	{
		// get next stack frame (StackWalk64(), SymFunctionTableAccess64(), SymGetModuleBase64())
		// if this returns ERROR_INVALID_ADDRESS (487) or ERROR_NOACCESS (998), you can
		// assume that either you are done, or that the stack is so hosed that the next
		// deeper frame could not be found.
		// CONTEXT need not to be suplied if imageTyp is IMAGE_FILE_MACHINE_I386!
		if(! this->m_sw->pSW(imageType, this->m_hProcess, hThread, &s, &c, myReadProcMem, this->m_sw->pSFTA, this->m_sw->pSGMB, NULL))
		{
			this->OnDbgHelpErr("StackWalk64", GetLastError(), s.AddrPC.Offset);
			break;
		}

		csEntry.offset = s.AddrPC.Offset;
		csEntry.name[0] = 0;
		csEntry.undName[0] = 0;
		csEntry.undFullName[0] = 0;
		csEntry.offsetFromSmybol = 0;
		csEntry.offsetFromLine = 0;
		csEntry.lineFileName[0] = 0;
		csEntry.lineNumber = 0;
		csEntry.loadedImageName[0] = 0;
		csEntry.moduleName[0] = 0;
		if(s.AddrPC.Offset == s.AddrReturn.Offset)
		{
			this->OnDbgHelpErr("StackWalk64-Endless-Callstack!", 0, s.AddrPC.Offset);
			break;
		}
		if(s.AddrPC.Offset != 0)
		{
			// we seem to have a valid PC
			// show procedure info (SymGetSymFromAddr64())
			if(this->m_sw->pSGSFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromSmybol), pSym) != FALSE)
			{
				// TODO: Mache dies sicher...!
				strcpy_s(csEntry.name, pSym->Name);
				// UnDecorateSymbolName()
				this->m_sw->pUDSN(pSym->Name, csEntry.undName, STACKWALK_MAX_NAMELEN, UNDNAME_NAME_ONLY);
				this->m_sw->pUDSN(pSym->Name, csEntry.undFullName, STACKWALK_MAX_NAMELEN, UNDNAME_COMPLETE);
			}
			else
			{
				this->OnDbgHelpErr("SymGetSymFromAddr64", GetLastError(), s.AddrPC.Offset);
			}

			// show line number info, NT5.0-method (SymGetLineFromAddr64())
			if(this->m_sw->pSGLFA != NULL)
			{
				// yes, we have SymGetLineFromAddr64()
				if(this->m_sw->pSGLFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromLine), &Line) != FALSE)
				{
					csEntry.lineNumber = Line.LineNumber;
					// TODO: Mache dies sicher...!
					strcpy_s(csEntry.lineFileName, Line.FileName);
				}
				else
				{
					this->OnDbgHelpErr("SymGetLineFromAddr64", GetLastError(), s.AddrPC.Offset);
				}
			} // yes, we have SymGetLineFromAddr64()

			// show module info (SymGetModuleInfo64())
			if(this->m_sw->GetModuleInfo(this->m_hProcess, s.AddrPC.Offset, &Module) != FALSE)
			{
				// got module info OK
				switch(Module.SymType)
				{
					case SymNone:
						csEntry.symTypeString = "-nosymbols-";
						break;
					case SymCoff:
						csEntry.symTypeString = "COFF";
						break;
					case SymCv:
						csEntry.symTypeString = "CV";
						break;
					case SymPdb:
						csEntry.symTypeString = "PDB";
						break;
					case SymExport:
						csEntry.symTypeString = "-exported-";
						break;
					case SymDeferred:
						csEntry.symTypeString = "-deferred-";
						break;
					case SymSym:
						csEntry.symTypeString = "SYM";
						break;
#if API_VERSION_NUMBER >= 9
					case SymDia:
						csEntry.symTypeString = "DIA";
						break;
#endif
					case 8: //SymVirtual:
						csEntry.symTypeString = "Virtual";
						break;
					default:
						//_snprintf( ty, sizeof ty, "symtype=%ld", (long) Module.SymType );
						csEntry.symTypeString = NULL;
						break;
				}

				// TODO: Mache dies sicher...!
				strcpy_s(csEntry.moduleName, Module.ModuleName);
				csEntry.baseOfImage = Module.BaseOfImage;
				strcpy_s(csEntry.loadedImageName, Module.LoadedImageName);
			} // got module info OK
			else
			{
				this->OnDbgHelpErr("SymGetModuleInfo64", GetLastError(), s.AddrPC.Offset);
			}
		} // we seem to have a valid PC

		CallstackEntryType et = nextEntry;
		if(frameNum == 0)
			et = firstEntry;
		this->OnCallstackEntry(et, csEntry);

		if(s.AddrReturn.Offset == 0)
		{
			this->OnCallstackEntry(lastEntry, csEntry);
			SetLastError(ERROR_SUCCESS);
			break;
		}
	} // for ( frameNum )

cleanup:
	if(pSym) free(pSym);

	if(context == NULL)
		ResumeThread(hThread);

	return TRUE;
}

BOOL __stdcall StackWalker::myReadProcMem(
    HANDLE	  hProcess,
    DWORD64	 qwBaseAddress,
    PVOID	   lpBuffer,
    DWORD	   nSize,
    LPDWORD	 lpNumberOfBytesRead
)
{
	if(s_readMemoryFunction == NULL)
	{
		SIZE_T st;
		BOOL bRet = ReadProcessMemory(hProcess, (LPVOID) qwBaseAddress, lpBuffer, nSize, &st);
		*lpNumberOfBytesRead = (DWORD) st;
		//printf("ReadMemory: hProcess: %p, baseAddr: %p, buffer: %p, size: %d, read: %d, result: %d\n", hProcess, (LPVOID) qwBaseAddress, lpBuffer, nSize, (DWORD) st, (DWORD) bRet);
		return bRet;
	}
	else
	{
		return s_readMemoryFunction(hProcess, qwBaseAddress, lpBuffer, nSize, lpNumberOfBytesRead, s_readMemoryFunction_UserData);
	}
}

void StackWalker::OnLoadModule(LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size, DWORD result, LPCSTR symType, LPCSTR pdbName, ULONGLONG fileVersion)
{
	CHAR buffer[STACKWALK_MAX_NAMELEN];
	if(fileVersion == 0)
		_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s'\n", img, mod, (LPVOID) baseAddr, size, result, symType, pdbName);
	else
	{
		DWORD v4 = (DWORD) fileVersion & 0xFFFF;
		DWORD v3 = (DWORD)(fileVersion >> 16) & 0xFFFF;
		DWORD v2 = (DWORD)(fileVersion >> 32) & 0xFFFF;
		DWORD v1 = (DWORD)(fileVersion >> 48) & 0xFFFF;
		_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s', fileVersion: %d.%d.%d.%d\n", img, mod, (LPVOID) baseAddr, size, result, symType, pdbName, v1, v2, v3, v4);
	}
	OnOutput(buffer);
}

void StackWalker::OnCallstackEntry(CallstackEntryType eType, CallstackEntry & entry)
{
	CHAR buffer[STACKWALK_MAX_NAMELEN];
	if((eType != lastEntry) && (entry.offset != 0))
	{
		if(entry.name[0] == 0)
			strcpy_s(entry.name, "(function-name not available)");
		if(entry.undName[0] != 0)
			strcpy_s(entry.name, entry.undName);
		if(entry.undFullName[0] != 0)
			strcpy_s(entry.name, entry.undFullName);
		if(entry.lineFileName[0] == 0)
		{
			strcpy_s(entry.lineFileName, "(filename not available)");
			if(entry.moduleName[0] == 0)
				strcpy_s(entry.moduleName, "(module-name not available)");
			_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%p (%s): %s: %s\n", (LPVOID) entry.offset, entry.moduleName, entry.lineFileName, entry.name);
		}
		else
			_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s (%d): %s\n", entry.lineFileName, entry.lineNumber, entry.name);
		OnOutput(buffer);
	}
}

void StackWalker::OnDbgHelpErr(LPCSTR szFuncName, DWORD gle, DWORD64 addr)
{
	CHAR buffer[STACKWALK_MAX_NAMELEN];
	_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "ERROR: %s, GetLastError: %d (Address: %p)\n", szFuncName, gle, (LPVOID) addr);
	OnOutput(buffer);
}

void StackWalker::OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName)
{
	CHAR buffer[STACKWALK_MAX_NAMELEN];
	_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "SymInit: Symbol-SearchPath: '%s', symOptions: %d, UserName: '%s'\n", szSearchPath, symOptions, szUserName);
	OnOutput(buffer);
	// Also display the OS-version
#if _MSC_VER <= 1200
	OSVERSIONINFOA ver;
	ZeroMemory(&ver, sizeof(OSVERSIONINFOA));
	ver.dwOSVersionInfoSize = sizeof(ver);
	if(GetVersionExA(&ver) != FALSE)
	{
		_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s)\n",
		            ver.dwMajorVersion, ver.dwMinorVersion, ver.dwBuildNumber,
		            ver.szCSDVersion);
		OnOutput(buffer);
	}
#else
	OSVERSIONINFOEXA ver;
	ZeroMemory(&ver, sizeof(OSVERSIONINFOEXA));
	ver.dwOSVersionInfoSize = sizeof(ver);
	if(GetVersionExA((OSVERSIONINFOA*) &ver) != FALSE)
	{
		_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s) 0x%x-0x%x\n",
		            ver.dwMajorVersion, ver.dwMinorVersion, ver.dwBuildNumber,
		            ver.szCSDVersion, ver.wSuiteMask, ver.wProductType);
		OnOutput(buffer);
	}
#endif
}

void StackWalker::OnOutput(LPCSTR buffer)
{
	OutputDebugStringA(buffer);
}
